Grinding mill



Nov. 20, 1945.

J. R. HALL GRINDING MILL Filed Oct. 29, 1943 Patented Nov. 20, 1945UNITED STATES PATENT OFFICE John R. Hall, Chicas assienor to nternatonal Harves e Compa a r ti n)! N w Jersey Application October .29, 194s,SeriaLNo, 593,149

v. s lafiixed to a contro.1. handle 35 by mea s of a 6 Claims.-

invention relates to a new andimproved grinding mill and moreparticularly to a grinding mill or the plate type.

One ofthe principal objectsof this invention is to provide equalpressure throughout the entire annular surface of the grinding plates.

An important object of this invention is the provision of a grindingplate adjustment means in a grinding mill.

' Anotherzand further important object of this invention is to provide asingle control member for eflecting .a Vernier adjustment of the rindingplate separation, and :by a further movement of the control membertoefiect a iull separation of the grinding plates.

Qther and iurtherimportant objects will become apparent from thedisclosures in the fol.- lowing specification and accompanying drawing,in which:

Figure-1 shows a vertical sectional view of a grinding vmill; and

Figure 2 is a detailvof a front view of the device shown i F gure 1.

Asyshown in the drawing, the reference numeral ll-zindicates generally ahousing for the grinding m ll withroortions oi the entrance for themateial to be ground omitted, as theyform no part of the presentinvention. A grinding mill of this pe employs a hopper. :not shown, forthe entrenccoi food or the like, and at the base of the onor: is positoned an au er l2, which extends from the hopper-to the section I 3 orthe housin which section encloses the grinding plates and Th plate I4 is-stationarily fixed within the casing, whereas the plate L6 is rotatableland diueta le toward and away from the plate l4, dependi g on thefineness of grind required.

fllhe anger or Worm I2 is driven by the drive shaft II, which alsoimparts rotation to the plate It. The drive {or this plate I6 isaccomplished hrol ihit hu Whichis keyed to an .exten sion IQ of the-.shait H. Surrounding the hub Not the pla 6 is the inner rac o abearing 2 The bearing 22 is preferably of the ball type and is equippedwith an annular se ies of ba whichere alined within an annulargroove 24in the inner race 21 and within the groove '26 of an outer race 21. Thisouter race 21 is supplemented by a super-v imposed sleeve .28 whichextends in a rightward direction whereit'zabuts the-disk-like member 29.This disk member .29 has a central aperture 3|, which is threaded forreception of the threaded bolt-J rhe bo t 32 may be of numerous forms.bu shown is of the eve tape at 33., wherein it ment vof'the plate 16with respect to the plate it through sliding movement of .the ballbearing 22 within .a circular hearing within :the housing H. A bowedleaf spring Al maintains plate l-fi inas close relationship with theplate 14 as permitted by :the position of the disk 29 through thebearing inner race 2| contacting a shoulder 53 in the hub H3. Thethreads on the eye bolt 32 are rather small, and it is possible toeffect a Vernier adjustment of the plate iii in its relation to the.stationary .plate. Rotation of the eye bolt 32 in a clockwise-directionas viewed in Figure 2, will tend to draw the disk '29 toward the housing38 whereupon the spring ll will be limited -i-n its range of movement.'There is no positive withdrawing of the plate l6 from its place closelyadjacent the plate 44, but the spring 44 canno longer hold them closetogether, and it will be understood that when material is being ground,such material will cause the plates to separate their maximum distanceas allowed by the-positionof diskd-ll. Conversely, when the eyebolt isrotated counterclockwise, as viewed in Figure 2 the disk-29 will besepar'ated a g-reater distance from the housing 38 and thereby permitthe spring to iorcejthe plate [-6 closer to the plate 14 as previouslyexplained. Further, the face of the auxiliaryhousing '38 may 'becalibrated so that a definite rotational movement of the handle 34 i lautomatic ly brine about a predetermined Movement t e efo e at hecontrol handl 34 in a clockwise di ection. as nested-inflame :l i of therawing. :W 'Il cause an mmediateiand full release of the adjustableplate 16 by pulling oi the leaf spring 4| by the disc .29 against thehous ng 33.

his :is a safety ,ieature when it is desired to qu ck y releasethesorine tension on .thcsrinding p ate 15 a d t6- Itz' possibl -thathcrolmayhe ccasions when it s odes .dxthat grinding t e materialmay hestopped immediately, and ilitifi at that time that the control handle34' is swung through its second range of movement.

The bowed leaf spring 4| backs up the disk member 29 and exerts apressure thereon to maintain the plates l4 and IS in yieldingrelationship. This spring 4| has a central aperture, as shown at 42, forpassage of the eye bolt 32. Adjustment of the tension. of the spring 4|is obtained by adjustment bolts in the housing shown at 43 and 44 at theextreme ends of the spring 4|. bolts 43 and 44 are equipped with locknuts 46 Theand 41 and bolt heads 48 and 49. It is obvious that increasedpressure on the spring 4| will necessarily entail a greater pressure.between the plates before they will yield, and likewise a reducedpressure on the spring 4| permits separation of the plates I4 and I6upon'some lesser application of force.

l4 and- I6 at their wide annular mouth 5| and proceed inwardly towardthe restricted throat portion 52, whereupon it is either necessary thattheplates yield in a separation movement or that theplates be broken.This leaf spring 4| permits yielding- ,of the grinding plates to thepoint where the springwill contact the housing 38. The leaf springprovides a symmetrical application of pressure upon the disk-like member29, which in turn transmits force to the supplemental outer race 28 anddown through the bearing 22 to the inner race 2| which abuts theshoulder 53 in the plate, hub |8.

vA fan 54 is integral with the plate H5 and concentric therewith. Thisfan 54 acts tocarry the groundmaterial exiting from the outerperipheries of the plates I4 and IE to an elevator or the like, notshown, ,whereupon it is fed to some receptacle. v

A U-shaped bracket 56 has an aperture 51 for passage of the eye bolt 32and a second threaded aperture at 58 for the insertion of a lock pin 59.The sides of the U bracket GI and 62 enclose the controlhandle 34andprevent turning of the handle separately from the U bracket. A seriesof holes 63, positi0n8d1 n a circleconcentric with the eye bolt 32 inthe face of the housing 38, is ap 9 r e v h 9 k P3 53 It w ll be 91parent that the bracket 56 may be set at any posi- 1 tion in the holes63, and-that, therefore, the con 50 desired position. In this manner'theplate sepatrol'handle 34 can likewise be set and fiizedat any rationmaybe adjusted, and once adjusted it can not become maladjusted byslipping or unwar- 1 It is entirely possible that a stone or the likemay gain entrance to these plates and adapted to exert an end pressureagainst said bearing, said bearing in turn eilecting an end pressure onsaid plates.

3. In a grinding mill, a driving shaft, a pair of grinding plates, oneof said plates having a hub slidably keyed to said driving shaft, abearing for said driving shaft. superposing said hub and engaging -ashoulder on the inner side'ofqsaid hub, and a' leaf spring engaging saidbearing on the outer side, whereby force is transmitted through thebearing and hub shoulder to the plates.

' .4. In a grinding mill, a driving shaft, a pair of grinding plates,one of said plates having a hub slidably keyed to said driving shaft, abearing for said driving shaft superposing said hub and at its inner endengaging a shoulder on said hub, a leaf spring engaging the outer sideof said bearing, and means for equally adjusting the tension on saidleaf spring.

5. In a grinding mill, a driving shaft a-pair of grinding plates, one ofsaid plates having a hub, slidably keyed to said driving. shaft, abearing for said driving shaft superposing said hub and at its inner endengaging a shoulder on saidhub, leaf spring engaging the outer side ofsaid bear-: ing, means for equally adjusting the tension von said leafspring, and means for limitingmove: ment of said spring. I Y

6. In a grinding mill, a driving shaft, a pair of grinding plates, oneof said plates having a hub slidably keyed to said driving shaft abearing for said driving shaft superposing said hub and at its inner endengaging a shoulder on said? hub, a leaf spring engaging the outer sideof= one of said plates having a splined hub engaging a splined portionon said driving shaft, a bearing for said driving shaft slidably mountedin said housing and cooperatively engaging said hub, and a-flat springadjustably mounted in-said housing and adapted to exert pressure againstthe outer end of said bearing.

2. In a grinding mill having a housing, a driving shaft in said housing,a pair of grinding plates, one of said plates having a splined hubengaging a splined portion on said driving shaft, a bearing for saiddriving shaft slidably mounted in said a fiat spring adjustably mountedin said housing being in the form of a rotatable handle. 4

said bearing, means for equally adjusting the tension on said leafspring, means for limiting: movement of said spring, said meanscomprising a disc positioned between said bearingand I said spring, anda stud threadedly engaginga central aperture in said disc and furthermeans for" adjustably holding said stud. v 3

7. In a grinding mill, a housing; a driving shaft, a pair of grindingplates,one-'of said plates 3 having a hub slidably keyed to said drivingshaft,

? ment of said disc in following the sliding bearing;#'

said means comprising a th-readed bolt. engaging said disc, anda-holding member for-the-bolt outside said housing.' 4 I a 4 1| 8. In agrinding mill, a housing, a driving-shaft,-

' a pair of grinding plates; one'of said plates having a hub slidablykeyed'to said driving shaftpa bearing for said driving shaftjournaledagainst' a shoulder on saidhub, a disc adjacent the other sideof saidbearing, a spring holding said disc against. said bearing, meansfor limit ng move ment of said disc in following'thesli ing bearing,said means comprising 'a-threaded bolt en-' gaging said disc, andaholding member 'for the bolt outsidesaid'housing, said holding member9. In a grinding mill, a housing, a-drivingshaf a pair of grindingplates, one of said' platesha ing a hub slidably'keyed to saiddrivingsl'iaftf-a; bearing forsaid driving shaft journaled against-f ashoulder on said hub, a disc adjacent the other side of said bearing, aspring holding said disc? against said bearing, means for limitingjmov 3ment of said disc in following the sliding-bear-" ing, said meanscomprising'a threaded-bolten -j gaging said disc, andiaholdingmember-torti la bolt outside said housing, said holding memberbeing in the form of a rotatable handle and additionally hinged foroutward movement from said housing.

10. In a grinding mill, a housing, a driving shaft, a pair of grindingplates, one of said plates having a hub slidably keyed to said drivingshaft, a bearing for said driving shaft journaled against a shoulder onsaid hub, a disc adjacent the other side of said bearing, a springholding said disc against said bearing, means for limiting movement ofsaid disc in folliwng the sliding bearing, said means comprising athreaded bolt engaging said disc, a holding member for the bolt outsidesaid housing, said holding member being in the form of a rotatablehandle and additionally hinged for outward movement from said housing,and a cam on the lower end of said member.

11. In a grinding mill, a housing, a 'driving shaft, a pair of grindingplates, one of said plates having a hub slidably keyed to said drivingshaft, a bearing for said driving shaft journaled against a shoulder onsaid hub, a disc adjacent the other side of said bearing, a springholding said disc against said bearing, means for limiting movement ofsaid disc in following the sliding bearing, said means comprising athreaded bolt engaging said disc, and a holding member for the boltoutside said housing, said holding member being in the form of arotatable handle, means hinging said member for outward movement fromsaid housing, a cam on the lower end of said member, whereby rotation ofthe member will vary the limit position of the range of spring movementand swinging of the member outwardly on its hinge will cause the cam tofully release the spring tension, and the housing being calibrated forsaid member rotation to permit predetermined adjustment of said plates.

12. In a grinding mill, a housing, a driving shaft, a pair of grindingplates, one of said plates having a hub slidably keyed to said drivingshaft, a bearing for said driving shaft journaled against a shoulder onsaid hub, a disc adjacent the other sid of said bearing, a springholding said disc against said bearing, means for limiting movement ofsaid disc in following the sliding bearing, said means comprising athreaded bolt engaging said disc, and a holding member for the boltoutside said housing, said holding member being in the form of arotatable handle, said member being hinged for outward movement fromsaid housing, "a cam on the lower endof said member, whereby rotation ofthe member will vary the limit position of the range of spring movementand swinging of the member outwardly on its hinge will cause th cam tofully release the spring tension, and the housing calibrated for saidmember rotation to permit predetermined adjustment of said plates, andmeans for locking said member in angular adjusted position.

13. In a grinding mill, a housing, a driving shaft, a pair of grindingplates, one of said plates having a hub slidably keyed to said drivingshaft, a bearing for said driving shaft journaled against a shoulder onsaid hub, a disc adjacent the other side of said bearing, a springholding said disc against said bearing, means for limiting moveing, saidmeans comprising a threaded bolt engaging said disc, and a holdingmember for the bolt outside said housing, said holding member in theform of a rotatable handle, said member being hinged for outwardmovement from said housing, and a cam on the lower end of said member,whereby rotation of the member will vary the limit position of the rangeof spring movement and swinging of the member outwardly on its hingewill cause the cam to fully release the spring tension, and the housingbeing calibrated for said member rotation to permit predeterminedadjustment of said plates, said locking means comprising a U brackethaving its bight portion engaging any one of a plurality of aperturesformed in the housing and the member being retained against movement bythe sides of the U bracket.

14. In a grinding mill, a housing, a driving shaft, a pair of grindingplates, one of said plates having a hub slidably keyed to said drivingshaft, a bearing for said driving shaft journaled against a shoulder onsaid hub, a disc adjacent the other side of said bearing, a leaf springholding said disc against said bearing, means for limiting movement ofsaid disc in following the sliding bearing, said means comprising athreaded eye bolt engaging said disc, and a holding member for the boltoutside said housing,

15. In a grinding mill having a housing, a driving shaft in saidhousing, a pair of grinding plates, one of said plates having a splinedhub engaging a splined portion on said driving shaft, a bearing for saiddriving shaft slidably mounted in said housing and cooperativelyengaging said hub, and a flat spring adjustably mounted in said housingand adapted to exert a longitudinally directed pressure against saidbearing, the adjustable mounting of said spring comprising an adjustingscrew in the housing at the leaf spring's extremities.

16. In a grinding mill, a housing, a driving shaft, a pair of grindingplates, one of said plates having a hub slidably keyed to said drivingshaft, a bearing for said driving shaft journaled against a shoulder onsaid hub, a disc adjacent the other side of said bearing, a leaf springholding said ment of said disc in following the sliding beardisc againstsaid bearing, means for limiting movement of said disc in following thesliding bearing, said means comprising a threaded eye bolt engaging saiddisc, and a holding member for the bolt outside said housing, saidholding member in the form of a rotatable handle, said member beinghinged for outward movement from said housing, and a cam on the lowerend of said member, whereby rotation of the member will vary the limitposition of the range of spring movement and swinging of the memberoutwardly on its hing will cause the cam to fully release the springtension, and the housing calibrated for said member rotation to permitpredetermined adjustment of said plates, said means for lockingcomprising a U bracket having its bight portion engaging any on of aplurality of apertures in the housing and the member retained againstmovement by the sides of the U bracket.

JOHN R. HALL.

